Mazda 3 Service Manual: Climate Control Unit Inspection [Full Auto Air Conditioner]
1. Remove the climate control unit with the connector connected..
2. Switch the ignition to ON.
3. Connect the negative (-) lead of the tester to body ground.
4. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table.
-
If there is any malfunction, inspect the parts under Inspection item (s).
-
If the parts under Inspection item (s) are found to be normal (except for terminal 1M), replace the climate control unit.
-
For terminal 1M, first try replacing the power MOS FET. If there is still any malfunction, replace the climate control unit.
Terminal Voltage Table (Reference)
|
Terminal |
Signal name |
Connected to |
Measurement condition |
Voltage (V) |
Inspection item (s) |
|
1A |
|
|
|
|
|
|
1B |
|
|
|
|
|
|
1C |
+5V |
|
Switch the ignition to ON |
5 |
|
|
Switch the ignition to Off |
1.0 or less |
||||
|
1D |
GND |
Body ground |
Under any condition |
1.0 or less |
|
|
1E |
Sensor GND |
|
Under any condition |
1.0 or less |
|
|
1F |
Solar radiation sensor (RH) input |
Solar radiation sensor |
Sunlight shined directly on the solar radiation sensor |
4 |
|
|
Blocking light to solar radiation sensor |
1.0 or less |
||||
|
1G |
Potentiometer input |
Driver-side air mix actuator |
Set temperature at MAX HOT |
4.3 or more |
|
|
Set temperature at MAX COLD |
1.0 or less |
||||
|
1H |
Solar radiation sensor (LH) input |
Solar radiation sensor |
Sunlight shined directly on the solar radiation sensor |
4 |
|
|
Blocking light to solar radiation sensor |
1.0 or less |
||||
|
1I |
Potentiometer input |
Passenger-side air mix actuator |
Set temperature at MAX COLD |
1.0 or less |
|
|
Set temperature at MAX HOT |
4.3 or more |
||||
|
1J |
|
|
|
|
|
|
1K |
Potentiometer input |
Airflow mode actuator |
VENT |
4.3 or more |
|
|
BI-LEVEL |
3.4 |
||||
|
HEAT |
2.5 |
||||
|
HEAT/DEF |
1.6 |
||||
|
DEFROSTER |
0.7 or less |
||||
|
1L |
Evaporator temperature sensor input |
Evaporator temperature sensor |
Compared with temperature detected by evaporator temperature sensor |
Refer to graph 1 |
|
|
1M |
Blower fan speed control |
Power MOS FET |
Fan stopped |
1.0 or less |
|
|
Fan: manual 1st |
2.2 |
||||
|
Fan: manual 7th |
9.7 |
||||
|
1N |
Blower motor feedback |
|
Fan stopped |
B+ |
|
|
Fan: manual 1st |
9.8 |
||||
|
Fan: manual 7th |
0.4 or less |
||||
|
1O |
|
|
|
|
|
|
1P |
|
|
|
|
|
|
1Q |
Motor operation (COLD) |
Passenger-side air mix actuator |
Moving towards HOT |
1.0 or less |
|
|
Moving towards COLD |
B+ |
||||
|
1R |
Motor operation (FRESH) |
Air intake actuator |
Moving towards RECIRCULATE |
1.0 or less |
|
|
Moving towards FRESH |
B+ |
||||
|
1S |
Motor operation (HOT) |
Passenger-side air mix actuator |
Moving towards HOT |
B+ |
|
|
Moving towards COLD |
1.0 or less |
||||
|
1T |
Motor operation (RECIRCULATE) |
Air intake actuator |
Moving towards RECIRCULATE |
B+ |
|
|
Moving towards FRESH |
1.0 or less |
||||
|
1U |
Motor operation (COLD) |
Driver-side air mix actuator |
Moving towards HOT |
1.0 or less |
|
|
Moving towards COLD |
B+ |
||||
|
1V |
Motor operation (DEFROSTER) |
Airflow mode actuator |
Moving towards DEFROSTER |
B+ |
|
|
Moving towards VENT |
1.0 or less |
||||
|
1W |
Motor operation (HOT) |
Driver-side air mix actuator |
Moving towards HOT |
B+ |
|
|
Moving towards COLD |
1.0 or less |
||||
|
1X |
Motor operation (VENT) |
Airflow mode actuator |
Moving towards VENT |
B+ |
|
|
Moving towards DEFROSTER |
1.0 or less |
||||
|
2A |
Illumination control |
Instrument cluster |
Headlight switch ON and panel light control switch at MAX |
1.0 or less |
|
|
Headlight switch ON and panel light control switch at MIN |
11.5 |
||||
|
2B |
B+ |
ROOM 15 A fuse |
Under any condition |
B+ |
|
|
2C |
|
|
|
|
|
|
2D |
|
|
|
|
|
|
2E |
MS_CAN_H |
CAN related module |
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
|
|
|
2F |
TNS signal |
TNS relay |
TNS ON |
B+ |
|
|
TNS OFF |
1.0 or less |
||||
|
2G |
MS_CAN_L |
CAN related module |
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
|
|
|
2H |
IG2 |
HEATER 10 A fuse |
Switch the ignition to ON |
B+ |
|
|
Switch the ignition to Off |
1.0 or less |
||||
|
2I |
|
|
|
|
|
|
2J*1 |
Refrigerant pressure sensor input |
Refrigerant pressure sensor |
Compared with temperature detected by refrigerant pressure sensor |
(See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) |
|
|
2K |
|
|
|
|
|
|
2L |
|
|
|
|
|
|
2M |
Passenger compartment temperature sensor input |
Passenger compartment temperature sensor |
Compared with temperature detected by passenger compartment temperature sensor |
Refer to graph 2 |
|
|
2N |
Passenger compartment temperature sensor GND |
Passenger compartment temperature sensor |
Under any condition |
1.0 or less |
|
|
2O |
|
|
|
|
|
|
2P |
|
|
|
|
|
*1 MZR 2.3 DISI Turbo, MZR 2.5
|
|
|
Climate Control Unit Disassembly/Assembly [Manual Air Conditioner]
1. Disassemble in the order indicated in the figure.
1
Dial
2
Airflow mode wire
(See Wire Removal Note.)
(See Wire Installation Note.)
...
Climate Control Unit Inspection [Manual Air Conditioner]
1. Remove the climate control unit with the connector connected..
2. Switch the ignition to ON.
3. Connect the negative (-) lead of the tester to the body ground.
4. By inserting the positive (+ ...
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...
